1. Cov Khoom Siv Hluav Taws Xob: Kev Txiav Txim Siab Tshaj Tawm ntawm Kev Ua Haujlwm Zoo
Ntsia Hlau Tsim thiab Hnav
Screw Configuration: Cov qauv ntsia hlau sib txawv (xws li cov pa puv - xov, barrier - hom, thiab sib cais- hom) ncaj qha cuam tshuam rau cov khoom siv conveying efficiency thiab yaj siab- lub tsev muaj peev xwm. Rau shear- cov ntaub ntawv rhiab heev xws li PVC, gradient los yog kauj ruam - hom screws feem ntau yog siv, nrog rau compression piv ntawm 2.5: 1 txog 3.5: 1. Yog tias qhov sib piv compression tsawg dhau, lub siab yaj yuav tsis txaus; Yog tias nws siab dhau lawm, cov cua sov ntau dhau yuav ua rau PVC decomposition.
Degree of Wear: Qhov no yog qhov tseem ceeb rau kev txiav txim siab thaum ntsuas cov khoom siv. Qhov radial clearance nruab nrab ntawm cov ntsia hlau thiab chim yog ib qho tseem ceeb qhia. Rau kev ua PVC, qhov kev tshem tawm zoo tshaj plaws yog feem ntau ntawm 0.1 thiab 0.3 hli. Thaum qhov kev tshem tawm no nce ntxiv vim hnav, yaj ntws rov qab los ntawm qhov sib txawv ntawm cov ntsia hlau ya dav hlau, ua rau muaj kev poob qis hauv kev xa khoom. Piv txwv li, rau 65 hli ntsia hlau, yog tias qhov sib txawv ntawm 0.2 hli mus rau 0.5 hli vim hnav, qhov siab tshaj plaws conveying ceev yuav txo los ntawm 20% -30%.
Barrel Structure
Pub Chaw Tsim Khoom: Cov duab, qhov ntev, thiab muaj qhov yuam kev txias ntawm qhov chaw nres nkoj pub cuam tshuam rau qhov ntom ntom ntawm PVC hmoov thiab kev noj zaub mov zoo. Cov khoom noj tsis zoo tsim tau yooj yim tuaj yeem ua rau "bridging" lossis noj tsis sib xws.
Tuag thiab Filtration System
Tuag Resistance: Ib tug complex tuag lub taub hau ntws channel tsim, ntau compression piv, los yog ib tug ntev heev forming seem tuaj yeem ua rau tag nrho cov backpressure ntawm yaj ntws, yog li txo qhov ceev conveying.
Lim thiab Manifold Phaj: Qhov ntau dua qhov mesh suav thiab ntau dua ntawm cov txheej lim, qhov ntau dua qhov kev tiv thaiv rau yaj, ua rau txo qis hauv kev xa khoom ceev. Tib lub sijhawm, cov ntxaij lim dej kuj tseem pab tshem tawm impurities thiab txhim kho kev sib xyaw ua haujlwm.
2. Cov yam ntxwv ntawm cov khoom: Cov yam ntxwv cuam tshuam rau Flow Resistance
Formulation: Qhov no yog qhov yooj yim tshaj plaws thiab feem ntau siv los tswj txoj hauv kev tsim khoom.
Lubricants: Ntau dhau ntawm cov roj nplua nyeem sab nraud (xws li paraffin lossis PE wax) tuaj yeem ua rau ntau tshaj -lubricated zaj duab xis, ua rau cov yaj mus rau ntawm phab ntsa chim thiab txo cov kev xa tawm. Cov roj nplua nyeem tsis txaus (xws li stearic acid lossis polyethylene oxide wax) ua rau muaj kev sib txhuam ntawm cov khoom sib txuas hauv cov yaj, ua rau cov viscosity ntau dua, cov dej tsis zoo, thiab txo qis kev xa khoom ceev.
Fillers: Qhov sib ntxiv ntawm cov fillers xws li calcium carbonate tsub kom yaj viscosity thiab ndlwg tsis kam, yog li txo cov conveying ceev. Txhawm rau txhim kho cov dej ntws, cov roj nplua nyeem feem ntau yuav tsum tau kho kom haum.
Impact modifiers: Qhov sib ntxiv ntawm modifiers xws li CPE kuj nce yaj viscosity, uas muaj qee yam tsis zoo rau kev xa khoom ceev.
Resin Khoom
Molecular Weight thiab Distribution: Qhov hnyav dua molecular ua rau cov viscosity ntau dua thiab cov dej ntws nyuaj, ua rau txo qis hauv kev xa khoom ceev. Resins nrog ib tug dav molecular hnyav tis muaj ib tug dav ua qhov rais tab sis muaj kuj tsis zoo flowability.
Particle Morphology: PVC resins nrog cov duab tsis zoo sib xws thiab cov porosity tsawg muaj kev noj qab haus huv qis dua hauv seem pub, uas cuam tshuam rau kev xa tawm thawj zaug.
3. Cov Txheej Txheem Txheej Txheem: Tiag - Kev Tswj Xyuas Lub Sijhawm
Kev ntsuas kub
Kev cuam tshuam: Kub yog qhov tseem ceeb rau kev tswj cov viscosity ntawm PVC yaj. Thaum kub nce, yaj viscosity txo, flowability txhim kho, thiab conveying ceev nce. Txawm li cas los xij, PVC yog cua sov-sensitive; Qhov kub thiab txias heev (feem ntau tshaj 200 degree) ua kom nws cov decomposition, tsim cov pa roj thiab cov pob dub, uas ua rau cuam tshuam tsis tu ncua conveying.
Temperature Gradient: Ib qho maj mam nce qhov kub thiab txias gradient feem ntau yog teem rau ntawm cov khoom ntws, los ntawm cov khoom noj los ntawm seem homogenization mus rau qhov tuag. Ib qho gradient tsis raug (xws li qhov kub thiab txias hauv seem homogenization qis dua li hauv seem compression) tuaj yeem ua rau lub siab rov qab, cuam tshuam loj heev.
Ntsia Hlau Ceev
Cov nyhuv: Hauv qhov tsim nyog, qhov nce ntawm cov ntsia hlau nrawm ua rau ze li ntawm qhov nce hauv kev xa khoom ceev. Qhov no yog txoj kev ncaj tshaj plaws ntawm kev kho cov zis.
Kev txwv: Txawm li cas los xij, qhov ceev tsis tuaj yeem nce ntxiv mus tsis kawg. Kev kub ceev heev ua rau muaj kev kub ntxhov siab heev, uas tuaj yeem ua rau:
Khoom degradation: PVC decomposes vim overheating.
Plasticization tsis txaus: Cov khoom siv lub sijhawm nyob hauv lub thoob yog luv dhau, tiv thaiv kom tsis txhob muaj cov yas txaus.
Melt Breakage: Qhov saum npoo ntawm extrudate ua ntxhib.
Tuag Siab
Cov nyhuv: Ib qho kev nce siab hauv kev tuag (xws li, vim kev tuag blockage lossis kev thauj ntau dhau -tawm nrawm) txo qhov kev xa khoom ceev. Qhov no yog vim lub extruder yuav tsum kov yeej ntau dua rov qab los thawb cov khoom tawm.
4. Cov khoom siv hauv qab: Kev sib tw traction thiab txias
Traction Ceev
Matching Principple: Lub traction ceev yuav tsum tau ua kom haum rau lub extruder tus nqi pub.
Ntau dhau traction ceev: Qhov no yuav ua rau muaj zog tensile ntawm cov yeeb nkab, ua rau cov phab ntsa nyias, thiab tej zaum kuj yuav ua rau cov yaj mus rupture vim stretching.
Kev rub qeeb qeeb: Ua rau cov khoom ntim ntawm lub tsho tuag thiab lub tsho txias, ua rau lub zog rov qab los ntawm extruder, txo tus nqi pub, thiab ua rau cov yeeb nkab sag thiab deform vim lub ntiajteb txawj nqus.
Txias thiab ua kom zoo
Txias lub tsho tiv thaiv: Cov yam ntxwv xws li lub chamfer ntawm lub tsho txias inlet thiab qhov ntev ntev ua rau kev ua haujlwm. Yog hais tias tsis kam yog siab dhau lawm, nws ua rau kom tuag siab thiab txo tus nqi noj.
Txias Efficiency: Tsis txaus cua txias tiv thaiv cov yeeb nkab hauv lub tes tsho los ntawm kev ua kom khov sai, ua rau nws ncab thiab nyias nyob rau hauv lub zog ntawm traction. Txhawm rau tswj cov phab ntsa tuab, tus neeg teb xov tooj yuav raug yuam kom txo qis traction ceev, tsis ncaj qha cuam tshuam qhov nrawm ntawm tag nrho cov kab ntau lawm.